need help choosing intake and carb

I am using a Holley 650cfm it works nice really smooth Idel. and my manifold is a edelbrock preformer dual plane.

Go with the Performer RPM, reg or air gap. Another good one is Ford's A321. Different runner layout but works the same.The A321 is also a current version of the old "Cobra" high rise, Edelbrock F4B and Ford's C9OX intake. Performer is just an aluminum 4 bbl version of your 2 bbl intake. Works no better than the 60's 289/302 iron 4 bbl intake. If you want a Holley carb, these will do you: list # 1850, list # 80783, 80457, Street Avengers ? 570 is what you want. Want a mechanical secondary carb and don't mind fuel consumption? List # 4776-600 cfm double pumper.

I have a 600 cfm Edelbrock and an ol school Torker intake (horrible for daily driving!) but am switching over to a Perfomer RPM and keeping the same carb.